Catsear Toxic?

Updated 2026-03-06| 3 min read| 4,654 found this helpful

Catsear is confirmed to be toxic to horses, while its toxicity to cats, dogs and humans is currently unconfirmed

Ingestion of catsear by horses can cause stringhalt, marked by exaggerated back leg flexion and hopping gait

The specific toxic compounds in catsear that cause adverse health effects have not yet been identified

FAQ

Is Catsear toxic to Humans?

No documented cases of adverse effects in humans have been reported (Non-toxic)

Is Catsear toxic to Cats?

No confirmed toxicity or associated symptom data available (Unknown)

Is Catsear toxic to Dogs?

No confirmed toxicity or associated symptom data available (Unknown)

Is Catsear toxic to Horses?

Stringhalt, including exaggerated flexion of the back legs and abnormal hopping gait (Low)

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Toxicity Details

Humans

Non-toxic

No documented cases of adverse effects in humans have been reported

Cats

Unknown

No confirmed toxicity or associated symptom data available

Dogs

Unknown

No confirmed toxicity or associated symptom data available

Horses

Low

Stringhalt, including exaggerated flexion of the back legs and abnormal hopping gait

Toxicity Snapshot

Toxic PartsToxic plant parts have not been formally identified; all plant parts are considered potentially risky for horses until confirmed otherwise

Exposure RouteIngestion is the only confirmed exposure route linked to adverse effects in horses; no other exposure routes are documented as harmful

Toxic CompoundsToxic active principles have not been identified through existing ASPCA and toxicology research

First Aid & Prevention

First 30 Minutes

• If horse ingestion is suspected, immediately remove the animal from access to remaining catsear plants
• Collect samples of any suspected ingested plant for formal identification by a professional
• Monitor the horse closely for early signs of abnormal gait or hind leg movement issues

Contact Vet Immediately

• The horse displays any signs of abnormal gait, including exaggerated back leg flexion or hopping movement
• The horse is confirmed to have consumed large quantities of catsear, even if no symptoms are visible
• Observed symptoms persist or worsen over the first few hours after suspected ingestion

Prevention

• Inspect horse pastures regularly and remove all identified catsear plants to eliminate exposure risk
• Do not feed horses hay or forage that is confirmed to be contaminated with catsear
• Train horse care and pasture management staff to correctly identify catsear to reduce accidental exposure

Treatment & Prognosis

• Immediately eliminate all access to catsear for affected animals upon confirmation of ingestion
• Administer veterinarian-prescribed supportive care to manage stringhalt symptoms and aid recovery
• Monitor long-term gait function, as mild stringhalt often resolves spontaneously after exposure ends

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Professional Toxicology

Scientific NameHypochaeris radicata

AliasesFlatweed、Cat's Ear、False Dandelion

Toxicity Grade

HumansNon-toxic

CatsUnknown

DogsUnknown

HorsesLow

Target Organs

Neuromuscular systemHind leg tendonsAssociated muscle tissue

Mechanism of Action

• The exact mechanism of toxicity leading to stringhalt in horses is uncharacterized, as the responsible active compounds remain unidentified

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: No confirmed cases of catsear-related toxicity have been documented in cattle to date

Sheep: No adverse health effects linked to catsear ingestion have been reported in sheep

Goats: No catsear-associated toxicity cases have been recorded in goat populations

Confusion Risk

The following plants look similar and may be confused:

Common Dandelion Taraxacum officinale

Visually nearly identical to catsear, with both producing yellow composite flowers and jagged basal leaves. Key difference: catsear leaves are fuzzy/hairy, while common dandelion leaves are smooth and more sharply serrated.

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Related Toxic Plants

Common Ragwort

Jacobaea vulgaris

High; causes irreversible liver damage in grazing animals and pets

Common Groundsel

Senecio vulgaris

Moderate; causes liver toxicity and gastrointestinal distress in livestock and small animals

Florist's Chrysanthemum

Chrysanthemum morifolium

Low; causes contact dermatitis and mild gastrointestinal upset in pets and humans

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Data Sources

1. ASPCA Animal Poison Control

This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.